Electrically operated pumping apparatus



Aug. 29, 1933. D. M. PEARSON ELECTRICALLY OPERATED PUMPING APPARATUS Filed Oc't. 7, 1930 Patented Au .29,1933* 4 1,924,412 I minimize-ermineramme- 1 3 APPARATUS, I v v V 'Dorrald M fearson, l s I f Application October 51,1930; Serial No." 486,959 "ficid m ioi.1639381 "The presentinventio n relates to improved 'elecshaft 8. rotatable, mounted. therein isaidfshaft trically'operated pumping apparatus such as are carrying a relatively thin motor disk 2.} The employed with oil burners. periphery ofthe diskpasses between spacedrnag In certain classes of apparatus'itis desirable to nets '1'? and l5carried by the frame 16 and fas- 5 start and stop andto regulate" the rate of move-' tened to the frame 1. The magnets are supplied 60 ment of a pump, dependent'on the rise or'fallof with alternating electric current through the con-i I s the pressure of "the fiu'id pumped-{ and this-has ductors 26'. ,This structure constitutes'an alter; 'been,,in'the* 'majority of applications, controlled nating current diskinduction motor. The disk by switch means or by a bypass valve set atthe 2 will rotate as long as'current issupplied to the 1Q desired pressure. magnets 1'7 andl15' and the, retardation load;6 v

The principal object of the present invention placed thereon is. not too great. The rateof is to provide an electri'cally operated pump havmovement of the disk will, depend onthe current I ing a mechanism which operates to automatically supplied through the conductors 26 and the total interrupt or retard the pump operation upon,ris-' resistance, pump load, to the disk rotation? In 15 ing of pressure in the pump to a given amount. my device the current supply is maintainedcon- 7 Furthermore, this mechanism becomes inoperstant andthe resistance'to disk movement is.

ative upon such rising of pressure without the atpump load -which varies with the fluid pumped.

tendant danger of overheating. In addition to The rate'of disk movement will, therefore-befa'st this, the starting and stopping operation of the H or slow depending on whether the pump load,-

gopump is entirely automatic and is dependent rate of fluid pumped, at any givenpressure is re- 75- upon the building up or relieving of pressure in ducedlorincrease d; and if the fluid discharge is the pump. The operation of the electrical mechshut off as at a fuel nozzle the diskwillstop and: anism employed in connection with the present so remainuntil the discharge is opened when invention is effected. without the necessity 'of' the pump will-again deliver.

utilizing switches or other circuit controlling de- 'During the stop period there will be no burning 30 vices. out or other injury to the pump or coils, opera- Another object isto provide a pump actuating .tion willbemerely interrupted or will proceed at mechanism which consumesbut little electricity, the proper rate to givev i the predetermined is noiseless and sufficiently powerful for the work pumped fluid delivery. When the retardation or 30 intended. It also has the feature of slow-moving brake load on the shaft}; is sufficient to overcome $5- parts which require little attention tolubrication the induction force of the magnets and 17' and can beused in devices which receive very the rotation of the shaft will cease until the infrequent attention. i pressure or force is relieved.

With the foregoing and other objects in view' Shaft-8 carries a gear which meshes with 35, the invention consists in the novel. construction a gear 19 of a larger diameter on a-shaft 10, the,

and combination of parts hereinafter described, latter being rotatable in bearings (not shown) illustrated in the accompanying drawing, and "in the frame 1. Shaft 10-has an eccentriclO' onpointed out in the claim hereto appended, it being onev end surrounded by a second eccentric; 11' 170-. understood that various changes in the form, protatably mounted thereon and having aset screw 40- portion, size and minor details of construction 31 therein. Rotation of the eccentric 11' about;

within'the scope of the claim may be resorted the eccentric 10 on the shaft 10 has the effect to without departing from the spirit or sacrificing f changing thev eccentricity f the cce tri 10'. any of the advantages of the invention. and'thereby'lengthens orshortens the stroke of I ,In the drawing; the pump. Whenthe desired length of stroke 45. Figure 1 is vertical elevation of a preferred is obtained the screw 31 is tightened, clamping I "form of my invention showing-in particular a the two eccentrics together. Superimposed about cross-section of the pump cylinder. the eccentric 11'15 the eccentric bearing l3and' Figure 2is a verticalelevation of the invention the eccentric strap 12c0nnected by the pin 14 showing in cross-section the motor disk, the to the piston rod 4 which in turn passes through 4 5o gears, the bearings and the eccentric driving the guideplate 6 and connects toa metal bellows T mechanism designed to cause the pump to, op- 5, which is shown in cross-section in Figure 1.

erate. I The metal bellows-is a stook'element,,purchasable Referring particularly to the drawing, 1 indie in the open market. The motion of the eccentric cates a suitable frame having bosses cast the're- 11 causes the piston rod 4 to expand andcoiitract 55; on to support shaft bearings 9 andhaving a fthebellows 5 giving in effect a piston pump but- 1 10 without the usual friction and undesirable packing glands. However, other types of pumps such as an ordinary piston pump can-be used if desired.

The bellows 5 is suitably secured to the guide plate 6 and the guide plate 6 is ,in turn secured to the pump and cylinder 3 by means of screws or the like. An inlet port is shown at 30. This port is provided with a valve 24 having a seat 25 upon which there is adapted to seatra valve member 24. A discharge port is shown at 29 and this port is provided with a seat 23 having a valve member 22 associated therewith. The action of the valve members 24 and 22 is substantially the same as in any conventional pump, the inlet valve 24 opening when the bellows is contracted and closing when it expands, and the discharge valve 22 operating conversely.

Should the pressure on the outlet 29 build up sufiiciently high to overcome the ability of the magnets 15 and 17 to rotate the disk, the disk will stop rotating until such time as the pressure is relieved. I p v It will be observed that the starting, stopping and regulating. the rate of movement ofthe disk is accomplished without switches, governors or bypass valves and that the power source remains connected tothemagnets at all times. When it is intended to positively interrupt the opera- 7 I said motor shaft, an eccentric on said driven shaft, a second eccentric rotatably mounted on said first mentioned eccentric, means for locking disk type induction said eccentrics-with respect to each other in any desired angular position to vary the eccen tricity of said second eccentric with respect to said driven shaft,.a connecting rod for said piston connected to said second mentioned eccentric, said pump being arranged to pump liquid fuel from a sourc e of supply to an outlet, whereby adjustment, of said eccentrics relative to each other will increase or decrease the ,load on' the motor to permit stalling of the motor when, the,

predetermined torque has been'reached,

DONALD M. PEARSON. r T 

